IAH - EWR:
CO 40, 52 and for most of the week 152 are all 762.
EWR - IAH:
CO 49, 63, 51 are all 762.
As mentioned, the 772 flight has been Thursday CO51 EWR-IAH, and Saturday CO52 IAH-EWR during the past winter. Tonight's southbound and this Saturday's northbound will be the last.
You can still buy Y fares on those flights - around $1,200 roundtrip. BF seem to be sold out.